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Has your register been setup for a scanner before? It must have had the scanning PLU file setup by the original programmer as that is the only time the file can be allocated. Then you need to have the I/O setup correctly for the scanner port in the register and you need the scanner to have parameters set to the typical Casio standard, so it is no quick job unless you have done most of this or had it done for you.

Your PC is virus infected. Although you can install anti virus and run update for your protection but still the antivirus software can't be installed. Since pop up notice tells you to back up files for reformatting, then you need to transfer all data to drive D. If your formatting is on drive C, your files on the other drive willnot be deleted as long as you have to reformat the drive for your OS,.
Install first antivirus after the formatting and update your virus protector. After that you can transfer and install some of components in your system.
Most of the times viruses destroys your CD ROM drive and other systems.
Hope this will help you.
Enjoy.

Rhis error due to there is a resident virus or your system infexted by virus already. for the main time try to install other antivirus. you can get it here for free: http://free.avg.com/download-avg-anti-virus-free-edition

And then scan your system. You can remove the sysmantec if you like AVG or you can reinstall the symantec if there is no error in your system. remove either of the two antivirus to avoid conflict in the system.

The chatter in the hard drive could mean that it has a problem and it may be on it's way out.
The Fan being out is definitely a serious problem and the unit should not be used till the fan is replaced.
Once you correct the fan situation, you need to update and run your Anti-virus program. Download CCleaner, WinPatrol . Install and run them also.

I had a client's PC that was running slow and it was because of Windows Live One Care. I removed it and cleaned it up and got it back to normal.

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.Thanks, Joe

Sounds like you have alot of adware and or spyware on your machine. Look up a free scanner called adaware-se and do a scan to see if anything is found. Typically, adware, spyware will install numerous files on a pc without your consent, naturally not knowing it is happening. If you need further assistance, I'll be more than glad to help.